Fix File.Exists for pipe paths on Windows
#117333
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+111
−19
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This was referenced Jul 5, 2025
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This was referenced Jul 7, 2025
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Fixes: #69604
Also while working on a core fix (commit 1) I noticed that
dwFileAttributesis often compared to-1. Windows documentation reffers to it asINVALID_FILE_ATTRIBUTES, so I decided to name this constant for clarity